/Engine/Source/Developer/PhysicsUtilities/Public/ConvexDecompTool.h
Utility for turning arbitrary mesh into convex hulls. This can be called multiple times for multipleUBodySetupresults and they will be done processed in sequential order  InBodySetup BodySetup that will have its existing hulls removed and replaced with results of decomposition.
bool DecomposeMeshToHullsAsyncBegin ( [UBodySetup](API\Runtime\Engine\PhysicsEngine\UBodySetup) * InBodySetup, [TArray](API\Runtime\Core\Containers\TArray)< FVector3f > && InVertices, [TArray](API\Runtime\Core\Containers\TArray)< uint32 > && InIndices, uint32 InHullCount, int32 InMaxHullVerts, uint32 InResolution )